How many zeros to append in CRC?

The number of zeros to append in a CRC (Cyclic Redundancy Check) calculation is equal to the degree of the generator polynomial used in the CRC algorithm. For example, if the generator polynomial is of degree 3, you would append 3 zeros to the data before performing the division to calculate the CRC. This process helps ensure that the appended CRC value can be used to detect errors in the transmitted data.